Probably you are getting inferior alternators. If this model has an external voltage regulator, then possibly it is the voltage regulator instead of the alternator that is causing the problem. As a mechanic, there is nothing in the car that would cause the alternator to be ruined. Alternatively, some people suggest that if your battery is weak, this causes a strain on the alternators, but in 40 years of wrenching I believe that is not the case.
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